Sonora is the only incorporated city in Tuolumne County, California, United States, of which it is also the county seat. Founded during the Califor…Sonora is the only incorporated city in Tuolumne County, California, United States, of which it is also the county seat. Founded during the California Gold Rush by Mexican miners from Sonora, the city population was 5,003 during the 2020 census, an increase from the 4,610 counted during the 2010 census.
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